Campbell-scientific CS470/CS471 Compact Bubbler System Uživatelský manuál stáhnout pdf (Strana 38)

Appendix D. SDI-12 Sensor Support

D.1.3 Send Identification Command (aI!)

Sensor identifiers are requested by issuing command aI!. The reply is defined

by the sensor manufacturer, but usually includes the sensor address, SDI-12

version, manufacturer’s name, and sensor model information. Serial number or

other sensor specific information may also be included.

An example of a response from the aI! command is:

13OTT HACH CBS107

Where:

SDI-12 version =1.3

Manufacturer = OTT HACH

Sensor model = CBS

Sensor serial number = 107

D.1.4 Start Measurement Commands (aM!)

A measurement is initiated with M! commands. The response to each

command has the form atttnn, where

a = sensor address

ttt = time, in seconds, until measurement data are available

nn = the number of values to be returned when one or more subsequent D!

commands are issued.

D.1.5 Aborting a Measurement Command

A measurement command (M!) is aborted when any other valid command is

sent to the sensor.

D.1.6 Send Data Command (aDv!)

This command requests data from the sensor. It is normally issued

automatically by the datalogger after measurement commands aMv!. In

transparent mode, the user asserts this command to obtain data. If the expected

number of data values are not returned in response to an aD0! command, the

datalogger issues aD1!. TABLE D-2 shows the values returned when using the

send data command.

D-2

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 44 45 46

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Campbell-scientific CS470/CS471 Compact Bubbler System Uživatelský manuál Strana 38